<template>
  <div class="my-tab-bar">
    <!-- 遍历数组，渲染页面 -->
    <!-- 设置动态属性，如果点击的项的索引index等于activeIndex变量，就显示current样式高亮 -->
  	<div class="tab-item" v-for='(item , index) in list' 
    :key="index" 
    :class="{ current: index === activeIndex }"
    @click=" ChangName(index,item.componentName)">
      <!-- 图标 -->
      <span class="iconfont" :class="item.iconText"></span>
      <!-- 文字 -->
      <span>{{ item.text }}</span>
    </div>
  </div>
</template>

<script>
export default {
  props:{
    list:{
      type:Array,
      required:true,
      //props接收过来的值
      validator(val){
        //如果true验证通过，false验证未通过
        if(val.length < 2 || val.length >5){
          return false;
          console.error('props list must between 2 and 5');
        }
          return true;
      }
    }
  },
  data(){
    return{
      //设置一个变量
      activeIndex:0
    }
  },
  methods:{
    ChangName(index,componentName){
      this.activeIndex = index,
      this.$emit('ChangNameFn',componentName)
    }
  }
}
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}
    
.current {
  color: #1d7bff;
}
</style>